Graphical user interface for a display screen or portion thereof



FIG. 1 is a front view of the graphical user interface for a display screen or portion thereof showing the design of the graphical user interface. The broken lines of the display screen or portions thereof form no part of the claimed design. The text, images, wireless network indicator and battery indicator are for illustrative purposes and form no part of the claimed design. 

CLAIM The ornamental design for a graphical user interface for a display screen or portion thereof, as shown and described. 